Doorbolt



March 4, 1924; 1,486,029

' s. w. PAR-SONS DOORBOLT Filed June 27, 1921 2 sheets-sheet 1 March 4 1924. 1,486,029

. S. W. PARSONS DOORBOLT Filed June 2'7, 1921 2 Sheets-Sheet 2 Patented Mar. 4, 1924.

airs rare FFICEQ STUART VI. PARSONS, 0F NEiV BRITAIN, CONNECTICUT, ASSIGNOR .TO THE STANLEY WORKS, OF NEW BRITAIN, CONNECTICUT, A CCRPORAIION' OF CONNECTICUT.

DOORBOLT.

Application filed June 27, 1921.

T 0 all whom it may concern:

Be it known that I, STUART W. PARsoNs. a citizen of the United States, and a resident of New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in a Doorbolt, of which the following is a specification.

The object of the present invention is to provide a device of the character described having various features of novelty and advantage, and more particularly to provide a simple and effective arrangement for actuating the bolt.

Fig. 1 is a side elevation in central section.

Fig. 2 is a sectional view taken on line 22 of Fig. 1.

Fig. 3 is a longitudinal sectional view of the bolt showing its operating members in their extren'ie positions.

Referring to the drawings in detail, a denotes generally a casing, preferably formed of sheet metal, and having a barrel 10 and attaching flanges 11, 11. b is a tubular bolt movable longitudinally in the barrel. 0 is a lever pivoted in ears 12 springing from the sides of an aperture 13 in the. front of the casing. The lever c is preferably formed of sheet metal bent to the shape shown. The bolt 7) is longitudinally slotted as at 14: to accommodate the inner end of the lever c and carries a cam d with which the lever cooperates. This cam, in the present instance, consists of a flat plate having a shank portion fitting snugly within the bore of the bolt. 6 denotes a spring positioned between the barrel and the bolt for frictionally holding the latter in any position of adjustment.

It will be seen, particularly from the dotted lines, Fig. 1, that when the lever is operated to withdraw the bolt from extended position, the cam initially engages the lever at a point adjacent the fulcrum of the latter, so that the maximum leverage of the lever is employed in starting the bolt in its movement to retracted position. Furthermore, the active face of the cam (Z is of such curvature that the lever has a rolling engagement, as distinguished from a sliding contact with the cam, thus eliminating fric- Serial No. 480,575.

tion therebetween. The bolt may be moved v into locking position by pushing against the outer end of the bolt. It will be seen that with the arrangement described the bolt is positively moved in each direction.

It is noted that the cam (Z is shaped so as to provide means to vary the force exerted by the lever member 0 against the bolt 6 throughout the motion of the bolt when the force exerted against the lever is constant. As the bolt slides to the left, the leverage of the member 0 decreases since the point of contact recedes from the fulcrum 12. By this construction, a maximum force may be applied to start the bolt. This condition is advantageous since such a bolt usually requires more force to loosen it than is necessary to continue, its withdrawal through the rest of its length. The increased power thus obtained at the start does not alter the distance which the bolt should be moved since the leverage against the bolt thereafter decreases and the proportionate motion of the bolt and lever correspondingly increases.

It is, of course, obvious that my invention is susceptible of various modifications and changes which are within the spirit of the invention without departing from the scope of the following claims, it being understood that the present disclosure of my invention is by way of illustration only and it is not to be taken as restrictive of my conception.

I claim as my invention 1. In a device of the character described, a casing, a bolt slidable in the casing, a lever mounted on said casing, and a cam supported by said 'bolt, said cam having a contacting surface cooperating with said lever extending from side to side of said bolt, and

curved to provide an extensive rolling contact between the cam and said lever for a substantial extent of the throw of the bolt. 2. In a device of the character described,

a casing, a bolt slidable in the casing, a lever mounted on said casing, and a cam supported by said bolt, said cam having a contacting surface cooperating with saidlever and extending from side to side of said bolt and curved to provide a rolling contact for a substantial extent of the throw of the 1 ,asepze aperture thereof, a cam comprising a fiat plate having a cam surface at one end, and 1 a shank portion, the latter fitting snugly within the bore of the bolt, and a lever pivoted in said aperture of said casing and having rolling engagement with said cam.

STUART W. PARSONS. 

